spindle drive free from backlash Without initial tension of the threaded nut the threaded spindle is seen to have a lot of backlash. With initial tension of the threaded nut the threaded spindle is free from backlash. description ordernumber 365 see also: eccentric press with stroke adjustment pneumatics: 3/2-, 4/2- and 5/2-port directional control valves rotor pump external gear pump